Okay I just read this:
It is an easy and adaptable plant to grow and it is well suited for containers
growing happily in a pot for many years. It makes a good but odd houseplant or specimen. Prefers some direct sun but will scorch in hot, sunny, dry locations. In the
greenhouse, use a suffice
cactus soil with some peat (a soil that retains water yet drains well). The plants are allowed to dry slightly in-between waterings. If the plants are allowed to dry too much, they will go dormant. During the winter months, the plants are allowed to go dormant and are stored in the cold storage until
spring. Temperature: Reportedly hardy down to -5°C.
So maybe I need to let it go dormant during the winter, my mom always keep her's on her sun porch in the winter (just like a house plant) and outdoors in the shade during the summer months. Putting mine out during the summer did make the leaves wider and longer, so putting the pot outside did help. But there has to be something else I need to be doing.
Here is how I want mine to look or simular: